(2,3-difluorophenyl)hydrazine

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In each of two flasks, 775 mmol (100 g) of 2,3-difluoroaniline were added to 2 L of concentrated hydrochloric acid at -15° C. and treated dropwise with a solution of 852 mmol (58.9 g) of sodium nitrite in 500 mL of water. Ten minutes after the addition, the reaction was treated with 930 mmol (55.8 g) of urea. This was followed by rapid addition of a solution of stannous chloride dihydrate (968 mmol, 220 g) in 700 mL of concentrated hydrochloric acid precooled to -50° C. After 20 minutes, the solid from both reactions was filtered and combined. It was put into 3 L of 1M NaOH (aq) and extracted wtih 4×500 mL of ether. The extracts were combined, dried over MgSO4 and concentrated to afford 110 g of 2,3-difluorophenylhydrazine (763 mmol, 49%). Ten minutes after the addition precooled to -50° C the solid from both reactions was filtered extracted wtih 4×500 mL of ether dried over MgSO4 concentrated

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In each of two flasks, 775 mmol (100 g) of 2,3-difluoroaniline were added to 2 L of concentrated hydrochloric acid at -15° C. and treated dropwise with a solution of 852 mmol (58.9 g) of sodium nitrite in 500 mL of water. Ten minutes after the addition, the reaction was treated with 930 mmol (55.8 g) of urea. This was followed by rapid addition of a solution of stannous chloride dihydrate (968 mmol, 220 g) in 700 mL of concentrated hydrochloric acid precooled to -50° C. After 20 minutes, the solid from both reactions was filtered and combined. It was put into 3 L of 1M NaOH (aq) and extracted wtih 4×500 mL of ether. The extracts were combined, dried over MgSO4 and concentrated to afford 110 g of 2,3-difluorophenylhydrazine (763 mmol, 49%). Ten minutes after the addition precooled to -50° C the solid from both reactions was filtered extracted wtih 4×500 mL of ether dried over MgSO4 concentrated

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The title compound, EI-MS: m/e=242.1 (M+), was prepared in accordance with the general method of example 25b) from 2,3-difluorophenyl hydrazine and ethyl pyruvate.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The title compound, EI-MS: m/e=242.1 (M+), was prepared in accordance with the general method of example 25b) from 2,3-difluorophenyl hydrazine and ethyl pyruvate.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The title compound, EI-MS: m/e=242.1 (M+), was prepared in accordance with the general method of example 25b) from 2,3-difluorophenyl hydrazine and ethyl pyruvate.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In each of two flasks, 775 mmol (100 g) of 2,3-difluoroaniline were added to 2 L of concentrated hydrochloric acid at -15° C. and treated dropwise with a solution of 852 mmol (58.9 g) of sodium nitrite in 500 mL of water. Ten minutes after the addition, the reaction was treated with 930 mmol (55.8 g) of urea. This was followed by rapid addition of a solution of stannous chloride dihydrate (968 mmol, 220 g) in 700 mL of concentrated hydrochloric acid precooled to -50° C. After 20 minutes, the solid from both reactions was filtered and combined. It was put into 3 L of 1M NaOH (aq) and extracted wtih 4×500 mL of ether. The extracts were combined, dried over MgSO4 and concentrated to afford 110 g of 2,3-difluorophenylhydrazine (763 mmol, 49%). Ten minutes after the addition precooled to -50° C the solid from both reactions was filtered extracted wtih 4×500 mL of ether dried over MgSO4 concentrated

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The title compound, EI-MS: m/e=242.1 (M+), was prepared in accordance with the general method of example 25b) from 2,3-difluorophenyl hydrazine and ethyl pyruvate.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In each of two flasks, 775 mmol (100 g) of 2,3-difluoroaniline were added to 2 L of concentrated hydrochloric acid at -15° C. and treated dropwise with a solution of 852 mmol (58.9 g) of sodium nitrite in 500 mL of water. Ten minutes after the addition, the reaction was treated with 930 mmol (55.8 g) of urea. This was followed by rapid addition of a solution of stannous chloride dihydrate (968 mmol, 220 g) in 700 mL of concentrated hydrochloric acid precooled to -50° C. After 20 minutes, the solid from both reactions was filtered and combined. It was put into 3 L of 1M NaOH (aq) and extracted with 4×500 mL of ether. The extracts were combined, dried over MgSO4 and concentrated to afford 110 g of 2,3-difluorophenylhydrazine (763 mmol, 49%). Ten minutes after the addition precooled to -50° C the solid from both reactions was filtered extracted with 4×500 mL of ether dried over MgSO4 concentrated

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The title compound, EI-MS: m/e=242.1 (M+), was prepared in accordance with the general method of example 25b) from 2,3-difluorophenyl hydrazine and ethyl pyruvate.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In each of two flasks, 775 mmol (100 g) of 2,3-difluoroaniline were added to 2 L of concentrated hydrochloric acid at -15° C. and treated dropwise with a solution of 852 mmol (58.9 g) of sodium nitrite in 500 mL of water. Ten minutes after the addition, the reaction was treated with 930 mmol (55.8 g) of urea. This was followed by rapid addition of a solution of stannous chloride dihydrate (968 mmol, 220 g) in 700 mL of concentrated hydrochloric acid precooled to -50° C. After 20 minutes, the solid from both reactions was filtered and combined. It was put into 3 L of 1M NaOH (aq) and extracted wtih 4×500 mL of ether. The extracts were combined, dried over MgSO4 and concentrated to afford 110 g of 2,3-difluorophenylhydrazine (763 mmol, 49%). Ten minutes after the addition precooled to -50° C the solid from both reactions was filtered extracted wtih 4×500 mL of ether dried over MgSO4 concentrated